Moriarty is such a RFB isnt he... there are all kinds of ways to break someone and he knows in Sherlock's case its to go after the very few that he has an actual emotional attachment to.. especially John. I predict much angst ahead as it all comes back to John.

I'm coming into this story late... And enjoying it. But I have a question..why is Sherlock letting Moriarty just walk away? Wouldn't he stop him? Beat the crap out of him? Turn him over to the police? Kill him? Something?